Philip I, known as Philip of Savoy (French: Philippe de Savoie, Italian: Filippo di Savoia-Acaia) (1278 – 25 September 1334) was the lord of Piedmont from 1282 until his death and prince of Achaea between 1301 and 1307.

[1] Philip's first marriage was celebrated in Rome on 12 February 1301 to Isabella of Villehardouin, Princess of Achaea.

By that marriage, he became Prince of Achaea, though he had already been lord of Piedmont by inheritance from his father in 1282.

In 1307, King Charles II of Naples, the suzerain of Achaea, confiscated the principality and gave it to his son, Prince Philip I of Taranto.

[3] In 1312, Philip married Catherine de la Tour du Pin (died 1337), daughter of Humbert I of Viennois[1] and had issue: This biographical article of a European noble is a stub.